package com.czc.datamask.util;

import org.springframework.util.Base64Utils;
import org.springframework.util.StringUtils;

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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.logging.Level;
import java.util.logging.Logger;
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import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;



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import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;


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/**
 * ASE加密工具类
 */
public class AseUtil {

    private static final String KEY_ALGORITHM = "AES";
    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";//默认的加密算法

    /**
     * AES 加密操作
     *
     * @param content  待加密内容
     * @param password 加密密码
     * @return 返回Base64转码后的加密数据
     */
    public static String encrypt(String content, String password) {
        try {
            if (!StringUtils.isEmpty(content)) {
                Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);// 创建密码器
                byte[] byteContent = content.getBytes("utf-8");
                cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(password));// 初始化为加密模式的密码器
                byte[] result = cipher.doFinal(byteContent);// 加密
                return Base64Utils.encodeToString(result);
            }
            return null;
        } catch (Exception ex) {
            Logger.getLogger(AseUtil.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }

    /**
     * AES 解密操作
     *
     * @param content
     * @param password
     * @return
     */
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    public static String decrypt(String content, String password) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE, getSecretKey(password));
            byte[] result = cipher.doFinal(Base64Utils.decodeFromString(content));
            return new String(result, "utf-8");
        } catch (InvalidKeyException e) {
            Logger.getLogger(AseUtil.class.getName()).log(Level.SEVERE, "解密失败，可能是由于加密的盐不同", e);
        } catch (Exception ex) {
            return content;
        }
        return content;
    }



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    public static String decrypt(String content, String password) {
        try {
            //实例化
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
            //使用密钥初始化，设置为解密模式
            cipher.init(Cipher.DECRYPT_MODE, getSecretKey(password));
            //执行操作
            byte[] result = cipher.doFinal(Base64Utils.decodeFromString(content));
            return new String(result, "utf-8");
        } catch (Exception ex) {
            Logger.getLogger(AseUtil.class.getName()).log(Level.SEVERE, "解密失败，请检查salt是否一致", ex);
        }

        return content;
    }

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    /**
     * 生成加密秘钥
     *
     * @return
     */
    private static SecretKeySpec getSecretKey(final String password) {
        //返回生成指定算法密钥生成器的 KeyGenerator 对象
        KeyGenerator kg = null;
        try {
            kg = KeyGenerator.getInstance(KEY_ALGORITHM);
            //AES 要求密钥长度为 128
            kg.init(128, new SecureRandom(password.getBytes()));
            //生成一个密钥
            SecretKey secretKey = kg.generateKey();
            return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);// 转换为AES专用密钥
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(AseUtil.class.getName()).log(Level.SEVERE, null, ex);
        }
        return null;
    }
}